What is the: main Purpose of JavaScript vs PHP in web development

Question

Can we learn only one (js/php) and do all necessary stuff?
Can't we connect database by js?
Aren't they both web programming languages?

Answer 1

PHP is server side scripting language which do some other stuffs like processing request, connecting to database and on the other hand Javascript is a client side language.

NB: You can't connect to database using js

Answer 2

First of all thanks for reply,
Do you mean to say that js is for front end and php is for backend?

Answer 3

Yes

Answer 4

Okay, thank you :)